You do know that "it's" is short for "it is", right? You're like saying "it is tracts" here… which is grammatically erroneous.

And by "tracts", you do mean "tracks", right?

caucasian

Capitalise "Caucasian"; it is used as a proper noun here.

multiple stab wounds appearing and profuse bleeding occurring, or B, a heart attack. SCP-XXX-1 will begin to "die" from these illusions.

This is confusing. Are the ways of death an illusion to the SCP? Or to other people? Is the SCP itself an illusion? How did the Foundation know it has to be a hear attack when it is only an illusion? How would an autopsy be conducted to deduce cause of death if the entity dematerialise?

In general, the SCP is rather incoherent and depicted stalely. You have three entities at work here, but they are all disjoint and have no cohesion towards one another. They feel like three separate things than being three things joined by a common point (and location is not enough to support that; it would be the equivalent of every SCP found in Tokyo to be from one anomalous source).

But let us look at the three entities.

-1 is limited by the lack of characterisation. You just stated that it performs a routine every night, as though it were an automaton. Is it aware of the routines or the many times she "dies"? Does it know what is going on? Does it recall its previous iterations?

-2 is essentially reduced to a monster that kills people and machines for no reason or context. There is no basis for its actions, or attempt to show more than just the initial impression.

-3 feels like it is characterised by the archetype of the deal-making devil with a train theme. However, this is done in a limited manner and show only the barest surface of what it does. It does not go into any interesting directions here.

Overall, my suggestion is to figure out what is the overarching story here. Because it is not there, explicitly or implicitly. How do the three entities connect to each other? What should readers feel about these three and their plight?